DTC Troubleshooting

DTC P0731: Problem in 1st Clutch and 1st Clutch Hydraulic Circuit

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.

1. Warm up the engine to normal operating temperature (the radiator fan comes on).
2. Make sure that the transmission is filled to the proper level, and check for fluid leaks.
3. Drain the ATF through a strainer. Inspect the strainer for metal debris or excessive clutch material.

Does the strainer have metal debris or excessive clutch material?

YES - Replace the transmission, then go to step 11.

NO - Replace the ATF, then go to step 4.

4. Measure the line pressure.

Is the line pressure within the service limits?

YES - Go to step 5.

NO - Repair the ATF pump and the regulator valve, or replace the transmission, then go to step 11.

5. Measure the 1st clutch pressure.

Is the 1st clutch pressure within the service limits?

YES - Go to step 6.

NO - Shift valves B and C are stuck. Repair these valves and the related hydraulic circuit, or replace the transmission, then go to step 11.

6. Clear the DTC with the HDS.
7. Test-drive the vehicle: Start off in D, accelerate at 10% opened-throttle or more, and run the vehicle in 1st gear at speeds over 7 mph (12 km/h) with the engine speed at 1,000 rpm or higher, for at least 12 seconds. Slow down and stop the wheels.
8. Turn the ignition switch to LOCK (0). Repeat step 7, then go to step 9.
9. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC P0731 indicated?

YES - Repair the 1st clutch, or replace the transmission, then go to step 11.

NO - Go to step 10.

10. Monitor the OBD STATUS for P0731 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

YES - Intermittent failure, the system is OK at this time. If any other DTCs were indicated on step 9, go to the indicated DTC's troubleshooting.

NO - Check for poor connections and loose terminals at the input shaft (mainshaft) speed sensor, the output shaft (countershaft) speed sensor, and the PCM, then recheck. If the HDS indicates NOT COMPLETED, return to step 7 and recheck.

11. Clear the DTC with the HDS.
12. Test-drive the vehicle: Start off in D, accelerate at 10 % opened-throttle or more, and run the vehicle in 1st gear at speeds over 7 mph (12 km/h) with the engine speed at 1,000 rpm or higher, for at least 12 seconds. Slow down and stop the wheels.
13. Turn the ignition switch to LOCK (0). Repeat step 12, then go to step 14.
14. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC P0731 indicated?

YES - Check for poor connections and loose terminals at the input shaft (mainshaft) speed sensor, the output shaft (countershaft) speed sensor, and the PCM, then go to step 1.

NO - Go to step 15.

15. Monitor the OBD STATUS for P0731 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

YES - Troubleshooting is complete. If any other DTCs were indicated on step 14, go to the indicated DTC's troubleshooting.

NO - Check for poor connections and loose terminals at the input shaft (mainshaft) speed sensor, the output shaft (countershaft) speed sensor, and the PCM, then go to step 4. If the HDS indicates NOT COMPLETED, return to step 12 and recheck.